Pulverizing mill



H. R. COLLIN$ PULVERIZING MILL Filed March 10, 1924 Patented Dee 1e, 21sec. l lgfi HAERY 1'1; COLLINS, 03F ALLENTQWN, EIENNSYLVANEEA, ASSKGNOR T FULLER LE- HIGE COMPANY, A GQMERATEGN GE PEEHFSYLVANIA.

EPULVEEJZING Application filed March 10, 19%. serial 1%. 898,001.

To all whom it may concern: ing the material from the pulzerizing Zone Be it known that l, HARRY R. Somme, a into the zone of [action of the superimposed 55 citizen of the United States, residing at lifting blades Recliating frcrn the hub in Allentown, in the county of Lehigli, State a plane spaced above the plane of the arms 5 of Pennsylvania, haye invented certain new first mentioned is another series of? arms and useful Improvements in Peiverizing which carry the lifting blades and each of Mills; and. I do hereby declare the followthe second series of arms has a vertical ex- 60 ing to be a full, clean and exact description tension tc which secured e ring carrying oi the invention, such is vill enable others the fan blades. The construction of this 1 skilled in the art to which it sppertains "co yoke ofie'rs certain problems in manufacmake and. use the same. time incl under actual cpereting conditions The present invention relates to pulveri: has been 019ml chat arms on which izing mills such as are illustrated in U. L operating clc'eices are mounted: occasion- Letters Patent Nos. 8 29,71 8"; 922,468; 1 mil 4 hr M A F'fl e J. 5 J ,ud{).,a21, and 1,358,833, issuecl to James illfi' eniinvention is ineenelecl to pro WI Fuller and showing a mill commonly vide a new improves? yoke constrncticn known as the Fuller mill. FUl'VQllZlilg se im a F ie? mill ie type sleeve 79 lnills of this type have a pulverizing zone p'rcvisicn of a containing a race-Way Within which cperh simpler to ccnstrezct, end 2% gigs & nultiplicity pulygyif g c- 11026 lIQS%IVlC-B, x vitll (11%Y0kfi PM? tnctecl by rot ting lie material vioksly em'plcyecl the several arms were pulverized in the race-Way is rais d frcm the puii'erizing zone largely by s on steal by t ""ting eludes which elevate the line; puivei-ized i'nateriel intc the Zone ccticn s sueerjscent s fee crizcntcliy and extended cut- 7 31'! the ire or line of the Witn me new type of yoke, f "f s the subject, of this ino devices mounted cenerel hub, which previensly Tc"- curse; place encl necessity erise. 8o further in'vclves the revea eels-ell) 5; devices is cf ens pnsliers s, and "cite plews which ground by the cells 1 cctceemclctes she and i -1 blades icy impreve means s c'blcei' advantages p221; m e ccnsidsubtleties of e uilles. c "yoke cencle'mte the n I cicns each of D we 0 izmsneins form the functions of both those devices, is mounted on each projection and it has a square shank extending from its upper face which is intended to be received loosely in the recess in the projection. The body of the device also has a vertical bore extending through it which is to register with the bore in the projection, and through the passage thus formed is inserted a holding pin which is held in place by a locking pin which may take the form of a split, tapered pin, inserted through a slot formed through the main pin and engaging the upper surface of the projection. On the outer end of each projection is cast or otherwise formed a rib which extends downwardly and forwardly and which is intended to form a support for a lifting blade, which may take the form of a flat plate provided with a vertical flange disposed along its outer edge. Connecting the projections near their outer ends are arcuate members which are provided with extensions lying above the plane of the projections. These extensions may be of any desired form, but preferably taper upwardly so as to provide the maximum strength. Secured in any convenient manner. on the outer surface of the upward extensions are blades acting as a fan, and each fan blade is mounted so as to lie between a pair of the main yoke projections and somewhat forward of the vertical median line between these projections so that each blade may be considered to be associated with one of the lifting blades and to lie slightly to the rear of the upper end thereof.

The plow-pushers which I have illustrated in the drawings presently to be described, are provided with curved front faces which are adapted to engage and propel a ball and the forward lower edge of each plow-pusher is cut away so as to form a blade-like surface which extends outwardly and curves to the rear along the front and along a part of the outer face of each plow-pusher. On its outer edge the body of the plow-pusher is provided with an upwardly and rearwardly inclined blade forming a scoop which communicates with the curved undercut blade previously mentioned. As the yoke with these plow-pushers rotates, the curved surface of the plow-pusher engages and propels the ball and the ground material which is packed down in the race-way by the passage of the ball thereover is dislodged therefrom by the front curved blade and forced outwardly to the inclined blade on the outer surface of the plow-pusher. The latter blade has a tendency to elevate this material and such particles as have been ground to the desired condition of fineness will be thrown upwardly into the zone of action of the lifting blades while the coarse, unground or partially ground material drops down in the race-way in the path of. the next succeeding ball of the series. With this construction the rotation of the yoke with the several devices mounted upon it not only results in a grinding of the material but causes a continuous movement or circulation of that material so that there is no tendency for the material to pack down within the race-way out of range of action of the balls. As each plow-pusher moves about the ring it not only throws the material upwardly so that it can be eventually thrown out through the screen, but such material as has not reached the proper degree of fineness is discharged by the plow-pusher where it can be most effectually acted upon by the balls coming thereafter.

The details of the construction of a yoke embodying the principles of this invention will be more apparent from a consideration of the accompanying drawings, in which Fig. 1 is a vertical sectional view of a Fuller mill. such as is illustrated in Patent No. 1,358,837, but having the new yoke construction employed therein, the section being taken-on the line 11 of Fig. 3,

Fig. 2 is a view in side elevation of the improved yoke construction, showing the balls in the positions which they would normally occupy relative to the faces of the plowpushers,

Fig. 3 is a top plan view of the apparatus illustrated in Fig. 2,

Fig. 4 is a vertical, sectional View of a detail of the yoke and plow pusher taken on the line 4.-4' of Fig. 3,

Fig. 5 is a view in cross section on the line 55 of Fi 4,

Figs. 6, g and 8 are, respectively, top plan, outer side, and front elevational views of the plow-pusher.

The general details of the mill construction are described fully in Patent No. 1,358,837, and need not here be repeated, but the mill will be seen to consist of a base 9 on which is mounted a standard 10 earlying the casing which surrounds the grindlng mechanism. On top of the casing is mounted a frame 12, within which is a cylindrical screen 13 and the material is fed into the upper part of the casing by means of suitable feeding mechanism. conventionally shown at 14. Mounted in appropriate bearings. within the mill. is a vertical shaft 15, which is driven from any convenient source of power by means of a pulley 16.

The grinding mechanism consists of a grindlng ring 17 having a suitably formed inner face, which, with a carrier'18, provides a race-way in which travel the grinding devices. here illustrated as balls 19. Secured to the shaft 15, as by means of the key 20 is a yoke 21 which carries fan blades. a plurality of lifting blades and the devices by which the balls are propelled and the material elevated from the race-Way.

This yoke 21, as will be seen more clearly from a consideration of Figs. 2 and 3, consists of a central body or hub 22, having an opening 23 through which passes the shaft 15. This hub is also recessed to receive a shank 24 extending upwardly from and forming a part of the carrier 18. Radiating from the hub is a series of projections 25, here shown as four in number and spaced 90 apart. These projections are of rugged construction and at their outer ends they have downwardly tapering portions 26. Within the tapered portions are formed square recesses 27 extending upwardly into the body of the extension a slight distance. Formed through the extension 'in communication with the recess is a cylindrical bore 28 and the main body of the hub is cut away, as at 29, for a purpose presently to be described. A. propelling device is intended to be mounted on each projection, and in the present drawings these devices have been shown inthe form of plow-pushers although other types of devices may be used if desired.

These plowushers consist of a body 30, the upper surface of which is beveled as at 31. Extending from the top of the body is a square shank 32 which is adapted to be received in the recess 27. This shank is slightly smaller than the recess into which it is received, as shown in Fig. 4. The top surface of the plow-pusher is flattened about the shank as at 33, and the body has a cylindrical bore 34, extending upwardly through it and through the middle of the shank. The plow-pusher is intended to be mounted in place by means of a locking pin 35 which has a head 36 overlying the bottom surface of the body as illustrated in Fig. i. The pin 35 is of sufficient length to extend upwardly through the body of the plow-pusher and through the extension, and is provided at the top with a slot in which is to be inserted a split, tapered locking key or pin 3?. When the parts are in assembled relation, as is illustrated in Fig, 4, and the locking pin is in place, it will be seen that the pin bears against a shoulder or boss 38, forming part of the extension. The lower surface of the extension also provides bearing surfaces or heels 39 and all) so that when the mill is in operation, with the plow-pusher performing its function of propelling the ball and lifting the material, the strain, which. would normally be a bending strain, exerted on the yoke arms in the construction previously used now becomes a tension strain exerted upon the pin This is brought about by the leverage exerted by the plow-pusher against the heels 39, 450, the looseness of the shank permitting this action. As be forged and heat treated it may be made much stronger than the ordinary cast steel part formerly used. This construction, therefore, clearly strengthens the parts and lessens the possibility of breakage when in use. Also it provides a convenient means of removing a plow-pusher should occasion arise. The square shank with which the plow-pusher is provided and which enters the square recess, prevents the plow-pusher from twisting about its axis when in use.

Formed as a part of each extension is a downwardly and forwardly inclined rib 41 to which may be bolted or otherwise secured a lifting blade 42. The lifting blade which I prefer to employ for this purpose has a flat inclined surface a3 and a vertical flange 44 located along its outer edge. This flange ta ers in width and has a considerable height at the lower end, tapering downwardly toward the surface of the blade at the upper end as at 45.

. Connecting the projections near their outer ends are arcuate members 46, and extending upwardly from these arcuate members, and forming an integral part thereof, are members 4E7 which are here illustrated as tapering toward their upper ends, the bases being of substantially the same width as the arcuate members themselves. These extensions 47 provide supports for fan blades and have vertical ribs or fins 48 to which the blades 49 are bolted or otherwise secured. These blades extend vertically and it will be noted that each blade lies some- What in advance of the median line of the extension. Also, since the blades are located between the projections which carry the lifting blades, it will be seen that each fan blade is associated with one of the lifting blades and lies somewhat to the rear of the upper end thereof.

'With this yoke construction it will be seen that the yoke which may be cast as a unit, is given the maximum strength and by reason of the manner in which the plow-pushers are secured thereto, there is little likelihood of damage occurring to the yoke when in use. The strains resulting from the propelling function of the plow-pushers are absorbed by members in. tension, namely, the pins 35 and since these pins may be made of specially treated material, an extremely rugged construction may be produced.

The plow-pushers which I have illustrated as mounted on the new yoke have been described consisting of a body, the upper edge of which is beveled away. This body has a projecting square shank which is intended to fit in a corresponding recess formed in one of the hub projections, being held in place by means of the pin previously referred to. The outer lateral surface 50 of the plowpusher is on an arc and the front face 51 which extends in a somewhat radial direction with reference to the axis of the mill, is given an inwardly curved llll form so as to form a seat for a ball. The lower surface of the bodv of the plowpusher is formed with a downwardly extending rib 52, which will be seen from Fig. 6 to extend from the inner to the outer face of the body, curving rearwardly at its outer end. As is shown at 53, the body of the pusher is cut away behind this rib so as to provide a flat surface54 against which the head of the pin may seat. The extending edge of the front face is beveled as at 55 along its lower surface, this bevel communicating with the rib 52. Also the inner end of the rib is cut away at an angle, as at 56. Disposed on the outer face of the body of the plow pusher, and extending upwardly and rearwardly therealong is a fin or blade 5? which acts as a lifting blade for the material acted upon by the ball: It will be seen that as the plowpusher progresses about the ring the rib 52 acts to dislodge and free the material passed over by the ball, and this material slides along the rib until it is conducted to the blade 57, the rearwardly curved end of the rib 52 communicating with this blade so that the material may be easily conducted to it. The inclination of the blade is sutficient to elevate the materiel sharply and those particles which are of a suficient degree at fineness are thrown into the zone of action of the lifting blades 42, and are thence elevated where they may be floated against the screen by the fan while the coarser, heavier articles which are unground or but partially ground, all in the race-way in the zoneof action of the next succeeding ball. lows, therefore, that there is what may be said to be a continuous circulation of material in the mill and this greatly increases the output and also makes the action of the grinding mechanism more efficient since there is no material which is packed down so that it is repeatedly passed over by the balls without being raised and delivered by the fan.

"While l have illustrated the new yoke provided with four projections, each of which carries a plow-pusher so that the mill has four grinding balls. it will be understood that instead of plow-pushers ll may use plows, and pushens on the alternate arms, such devices being properly designed so as to be capable of being mounted on the projections in the manner here illustrated Also, plow-pushers of other forms and designs may be employed, although any such plow-pusher should have the square shank here illustrated for insertion into the recess in the bottom end of the rejection, and should also be designed so t rat the strains arising from. 'its use are absorbed by thev pins 35.

1 claim:

1. lln a pulverizing mill, a pulverizing zone containing a grinding ring, a yoke rotatably mounted in the mill, grinding balls freely movable in the grinding ring, a plurality of devices for engaging and propelling the balls and for dislodging the material passed over by the balls, and means in tension for securing the devices to the yoke.

2. In a pulverizing mill, a pulverizing zone containing a grinding ring, a plurality of v freely movable grinding balls therein, a yoke rotatably mounted in the mill, a plurality of projections from the yoke, a device mounted on each projection and provided with means for propelling a ball and means for dislodging the material passed over by the ball, and means in tension for securing each device to its projection.

3. In a pulverizing mill, a pulverizing zone containing a grinding ring, a plurality of freely movable grinding balls therein, a yoke rotatably mounted in the mill and having a plurality of projections formed thereon, each projection being provided with a socket, and a device mounted in each socket and provided with means for engagrn and propelling a ball and means for dislodging the material passed over by the ball.

4. In a pulverizing mill, a pulverizing zone containing a grinding ring, a plurality of freely movable grinding balls therein, a yoke rotatably mounted in the mill and having a plurality of projections "formed thereon, each projection provided with a socket, a device mounted on each projection and provided with means for propelling a ball and means for dislodging the material passed over by the ball, each device having a portion thereof adapted to enter the socket. and means extending through the device and through the projection for securing the device in position. I

5. In a pulverizing mill, a pulverizing zone containing a grinding ring, a plurality of freely movable grinding balls therein, a yoke rotatably mounted in the mill and having a plurality of projections formed thereon, each projection provided with a socket, devices mounted on the projections for propelling the balls and for disloclging the material passed over by the balls, each device having a portion entering the socket, and means in tension for holding the devices in position with the said portions entering the sockets.

6. In a pulverizing mill. a pulverizing zone containing a grinding ring. a plurality of freely movable grinding balls therein, a yoke rotatably mounted in the mill and haw ing a plurality of projections formed thereon, each projection provided with a socket, devices mounted on the projections for pro polling the balls and dislodging the material passed over by the balls, each device having a portion entering the socket, and a pin passing through the device. the socket, and the projection, the device beingsup- 1,eie,eee

ported on the end of the pin and held thereby against displacement.

7 In a pulverizing mill, a pulverizing zone containing a grinding ring, a plurality of freely movable balls therein, a yoke rotatably mounted in the mill and having a plurality of projections formed thereon, devices mounted on the projections for propelling the balls and dislodging the material passed over by the balls, means in tension for holding the devices in position on the projections, and a lifting blade mounted on each projection above the said device.

8. In a pulverizing mill, a pulverizing zone containing a grinding ring, a plurality of freely movable balls therein, a yoke rotatably mounted in the mill and having a plurality of projections formed thereon, devices mounted on the projections for propelling the balls and dislodging the material passed over by the balls, means in tension for holding the devices in position on the projections, an upwardly and rearwardly inclined lifting blade mounted on each projection above the device, and a plurality of fan blades mounted on the yoke above the series of lifting blades.

9. In a pulverizing mill, a pulverizing zone containing a grinding ring, a plurality of freely movable balls therein, a yoke rotatably mounted in the mill and having a plurality of projections formed thereon, devices mounted on the projections for propelling the-balls and dislodging the material passed over by the balls, means in tension for holding the devices in position on the projections, an upwardly and rearwardly inclined lifting blade mounted on each projection above the device, and a plurality of fan blades mounted on the yoke above the series of lifting blades, each fan blade being associated with a lifting blade and bein disposed to the'rear of the upper end thereo 10. In a pulverizing mill, a pulverizing zone containing a grindin ring, a plurality of freely movable balls herein, a yoke rotatably mounted in the mill having a plurality of projections formed thereon, devices mounted 'on the projections for propelling the balls and dislodging the material passed over by the balls, means in tension for holding the devices in position on the rojections, an upwardly and rearwardly inclmed lifting blade mounted on each pro ection above the device, an upward extension from the yoke dis osed between each pair of projections, an a fan blade mounted on each extension above the liftin blades.

11. The com ination with a pulverizing mill having a plurality of inding balls movable in a gr nding ring, 0 a yoke rotatabl mounted in the mill and having a plurality of projections formed thereon, devices mounted on the lower, outer ends of the proj ections and serving to propel the balls and to j 16. A yoke for use in a dislodge the material passed over by the balls, and means in tension for securing the devices to the projections.

12. The combination with a pulverizing mill having a grinding ring and a plurality of grinding balls operating therein, of a ro tatable yoke mounted in the mill and having a plurality of projections formed thereon, devices on the rojections for propelling the balls and for dislodging the material passed over by the balls, means in tension for secur ing the devices to the projections, lifting blades mounted on the projections above the devices and a plurality of fan blades mounted above the lifting blades.

13. The combination with a pulverizing mill having a grinding ring and a plurality of grinding balls operating therein, of a rotatable yoke mounted in the mill and having a plurality of projections formed thereon, a socket formed in each projection, devices for propelling the balls and for dislodging the matenal passed over by the balls, pins passing through said devices and projections and serving to suspend the devices from the projections with a portion of each device entering the socket, a series of lifting blades mounted on the yoke above the device, and a series of fan blades mounted on the yoke above the lifting blades.

1 A yoke for use in a pulverizing mill having a grinding ring and a plurality of balls operative therein, which comprises a hub, aplurality of projections formed on the .hub, each projection having a socket formed in its lower, outer surface, a bore passing through the projection communicating with the socket, a lifting blade on each projection, and a series of fan blades mounted on the yoke above the lifting blades.

1a. A yoke for use in a. pulverizing mill having a grinding ring and a plurality of balls operative therein, which comprises a central hub, a plurality of projections formed thereon, each projection having a socket in its outer, lower end and a bore extending through the projection and communicating with the socket, arcuate members connecting the projections and extending there-above, and a fan blade mounted on each member.

ulverizin mill having a grinding ring an a plurality of balls operative therein, which com rises a central hub, a plurality of substantlally radial projections formed thereon, each projection having a socket in its outer, lower end and aibore extending through the projection and communicating with the socket, an arcuate member extending between each pair of rejections and projecting thereabove, a an blade mounted on each arcuate member above the plane of the projections, and a lifting blade mounted on each projection, each of the fan blades being associated with and disposed to the rear of the ing ring, and a plurality of balls operative therein, the combination of a yoke having a plurality of projections extending therefrom, each pro ection havin a socket formed in its lower, outer end, an a bore formed through the projection and communicating with the socket, a device for propelling a ball and for dislodging'the material passed over by the ball, mounted on each projection, t is device having a shank to. be received in the socket and a bore formed through the body of the device and through the shank adapted to register with the bore first named, a headed pin inserted through the registering bores and a lockin pin passed through the pin first named and adapted to hold the latter in position to secure the device to the projection.

18. In a pulverizing mill having a grindingring and a plurality of balls operative therein, the combination of a yoke having a central hub and a plurality of projections formed thereon, each projection having a socket formed in its lower, outer surface, a bearing surface disposed about said socket, and a bore extending through the projection and communicating with the socket, and a plow-pusher mounted on each projection, this plow-pusher having a shank adapted to enter the socket, a bearing surface about the shank to cooperate with the bearing surface on the pro'ection and a bore extending through the ody of the device and through the shank in registry with the bore first named, a pin'to be received in said bores, and means passing through the pin for engaging the projection and retaining the pin in position with the plow-pusher secured to the projection.

19. A plow-pusher for use in a pulverizing mill having a rotatable yoke, a grinding ring-and a plurality of balls operative therein, which comprises a body, a surface formed on the body for engaging a ball, means disposed on the body for dlslodging material passed over by the ball, means on the body for raising the material from the Surface of the grinding ring, a shank extendin upwardly from the top surface of the b0 y, and a bore formed through the body and through the shank.

20. A plow-pusher for use in a pulverizing mill havin a yoke .rotatably mounted therein, a grinding ring and a plurality of balls operative therein, which comprises a body having a forward surface adapted to engage a ball, a rib extending across the under surface of the body, an upwardly and rearwardly inclined rib connecting with the first named rib and disposed on the outer surface of the body, a shank extendin upwardl from the top surface of the b0 y, and a ore passing through the body and through the shank.

21. A plow-pusher for use'in a pulverizing mill havin a yoke rotatably mounted therein, a grin ing ring and a plurality of balls operative in the grinding ring, which comprises a body having a forward surface adapted to engage a ball, a rib extending across the under surface of the body, an upwardly and rearwardly inclined rib connecting with the first-named rib anddisposed on the outer surface of the body, a shank extendin upwardly from the top surface of the b0 y, a bearing surface formed about the shank, and a bore passing through the shank and through the body.

22. In aulv izing mill containing a grinding r' g" ani a lurality of balls operative ther in, the om ination of a yoke having a pil urality of socketed projections formed thereon, a bearing surface on each projection about the socket, and a bore in each projection communicating with the socket, a device for propelling a ball mounted on each projection and having a shank loosely fitting in the socket, a bearing surface formed about the shank and adapted to cooperate with the surface first mentioned, a bore formed through the device. and through the shank, and a'pin extending through both said bores and locked in place, this pin serving to secure the device to the projection.

In testimony whereof I afiix my signature.

HARRY R. COLLINS. 

